JPS585915A - Protecting relay - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a protective relay, and relates to an improvement in corrosion protection that prevents the phenomenon of silver migration.

The safety relay that protects the power system is not used by itself, but is attached to the switchboard that houses it and is used as a system that satisfies various incidental functions. It was usual.

Therefore, keep it as a switchboard! It is used in vertical electrical equipment sets, and in today's polluted atmospheric environment, there was an idea that a protective relay equipment set incorporating a switchboard could be used in a corrosive environment.

On the other hand, some users believe that the standards state that a single protective relay and a protective relay system are different, and that even under environmental conditions of 1 corrosion, the relay can withstand use as a single relay.
There were cases where it was required to meet the normal lifespan.

Conventional high-performance relays have two contacts in the electrical circuit 5 and use springs for rotational operation, so they can be used in 1114 environments, i.e., with considerable corrosive gases, as well as high relative humidity and demands during daily cycles. There was a demand for a single protective relay that could be used in a noisy environment where corrosion occurred within one year under conditions such as relative humidity of 1190%. The drawback is that metal materials that can withstand long-term use in such places, up to 20 years, are currently not available.

Figure 1 shows an example of the relationship between a protective relay and a switchboard. Box body 1. Base 2. n3. Panel 4. Protective relay5. Internal arrangement @6. Terminal block for external line 7, control cable 8.
Cable bit9. It consists of 10 atmospheres and 11 air areas inside the switchboard.

The object of the present invention is to store the protective relay as a single unit inside the case (
2 Relays stored 1!7! To improve the natural air environment and prevent soap from corrosion in the atmosphere 1: By supplying dehumidified, slightly pressurized air and performing nearing, even small amounts of ammonia gas generated from insulating materials can be removed. The purpose of the present invention is to provide a corrosion-proof relay that can prevent corrosive gases and high relative humidity air from entering the surrounding area.

The structure of the present invention will be explained below with reference to an embodiment shown in FIG. Switchboard box 1. Pace 2. door 3, panel 4
．． Maintenance relay 5. Internal wiring6. Terminal block for outside line7. Control cable 8. Cable bit 9° Atmosphere 1O1 Air inside switchboard 11. Pressure reducing valve 12, stop valve 13° high pressure air piping 14
, low pressure air piping 15 , pipe fitting 16 , dehumidifying high pressure air 1
7. It is composed of dehumidified low pressure air 18, leakage air 19, etc.

As in the present invention, when dehumidified and slightly pressurized air is sent into the case of Niho-eel relay 50, the current Houma-eel relay is not completely sealed, so there is some air leakage 19.
Adequate ventilation will be obtained.

Along with this air leakage 19, a trace amount of ammonia gas generated from the insulator is also discharged to the outside.

The corrosion factors of general C metals are largely influenced by temperature, relative humidity, and the type and concentration of corrosive gas. This is shown in Figures 3 to 5.
This will be explained with a diagram.

Figure 3 shows the tendency of the amount of corrosion in the temperature range in which maintenance relays are commonly used, and the difference between low and high temperatures is thought to be 3 times or less at most.

Figure 4 shows a book that shows the relationship between relative humidity and the amount of corrosion.With chlorine-based gas, there is rapid acceleration at a relative humidity of around 3096, but in general, it is a high-humidity environment with a boundary between 50 and 60 degrees. A drastic increase in the amount of corrosion was observed under the following conditions, and depending on the conditions (I), it would become a region of wet corrosion rather than dry corrosion.

Figure 5 shows the relationship between corrosive gas concentration and corrosion amount.
Curve C shows an example of a strongly corrosive gas, and curve D shows an example of a weakly corrosive gas, and many curves are obtained depending on the combination of gas type and metal.

However, in the case of corrosive gases, the concentration varies from below the detection limit, to near the detectable level, to slightly containing 1lf16 concentration, to within the permissible limit, to above the limit, but at a certain gas concentration, corrosion is rapidly accelerated and It has been observed that corrosion slows down.

Under these three conditions, if the relative humidity is below the sharp rise point, corrosion is very inactive and has a great suppressive effect. Experimental results have shown that even if a certain amount of corrosive gas exists in this low relative humidity state, there is almost no corrosive effect.

Based on these results, by sending dehumidified, slightly pressurized air into the relay, the amount of corrosion can be reduced by more than an order of magnitude, depending on the relative humidity.

Since corrosive gas does not enter C1, the amount of corrosion can be reduced by more than an order of magnitude.

In addition, the ammonia gas generated inside is also exhausted, so good results can be obtained.

As a synergistic effect, the amount of corrosion can be reduced by more than two orders of magnitude, so that the corrosion-related life of the maintenance relay can be extended by more than 1100 times, thereby ensuring the fully expected life of 10 to 20 years.

Furthermore, even if a pressure reducing valve is provided for each maintenance device, the effect will be reduced.

Sara? Niho-tsugiwa (even if you install a zero governor for two exhausts, the air purge function and dehumidification function do not change, so you can adjust the ventilation, and the effect is the same.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional safety relay and switchboard, and FIG. 2 is a cross-sectional view showing an embodiment of the present invention's safety relay and switchboard.
FIG. 3 is a graph showing the relationship between temperature and corrosion amount, FIG. 4 is a graph showing the relationship between relative humidity and corrosion amount, and FIG. 5 is a graph showing the relationship between corrosive gas concentration and corrosion amount.

Claims (1)

[Claims] A protective relay that is characterized by sending dehumidified, slightly pressurized air into the relay case.